CHEMISTRY HIGH SCHOOL

Which polyatomic ion contains the greatest number of oxygen atoms?(1) acetate (3) hydroxide
(2) carbonate (4) peroxide

Answers

Answer 1
Answer:

Carbonate ion contains the greatest number of oxygen atoms. So, the correct option is (2).

 

Polyatomic ion: refers to a charged chemical ion or species made up of two or more covalently joined atoms, or a metal complex that can be considered to behave as a single unit.

Acetate(C2H3O−) has two atoms of oxygen, carbonate has three oxygen atoms(CO_3^(2-)), hydroxide(OH)^(-) has one, and peroxide (H_2O_2)has two atoms of oxygen. Thus, carbonate has the highest number of oxygen atoms.  

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Answer 2
Answer:

Answer:

The correct answer is option 2, that is, carbonate.

Explanation:

A molecular ion, also known as a polyatomic ion, refers to a charged chemical ion or species comprising two or more atoms that are combined covalently, or of a complex of a metal, which can be regarded to be functioning as a single unit.  

Of the given options, acetate has two atoms of oxygen, carbonate has three oxygen atoms, hydroxide has one, and peroxide has two atoms of oxygen. Thus, carbonate has the highest number of oxygen atoms.  

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If the nucleus was the size of a tennis ball the atom would be the size of....?

Answers

If the nucleus was the size of a tennis ball, the atom would be the size of a sphere about 1,450 feet in diameter.

The size of one atom would be comparable to one of the world's largest sports stadiums if the nucleus were the size of a tennis ball, or around 1,450 feet in circumference.

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If you could find anything just bigger than a tennis ball, you're all good, because the nucleus is almost half the size of the atom, I think! U should find this helpful, if you do, great, I'm glad that I ciyld help

Which phrase most accurately describes a chemical change?Question 3 options:

A change on the molecular level.


A change in appearance.


A change in taste.


A change in form.

Answers

The phrase that most accurately describes a chemical change is; "A change on the molecular level."

The major difference between a physical change and a chemical change is that a chemical change involves a change in the composition of a substance.

This implies that the atoms in a substance are rearranged during a chemical change.

This rearrangement of atoms corresponds to change on a molecular level.

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The signs of a chemical reaction include
Production of a gas (bubbles)
Production of heat
Production of light
Color change
Production of a solid (precipitate) in a solution

So from those answers we see that A is the correct answer.

Sulfur oxides Carbon monoxides Chlorofluorocarbons (CFCs)Nitrates are responsible for the hole in the ozone layer.

Answers

The best answer for the question above would be the chloroflourocarbons or the CFCs. These chloroflourocarbons or CFCs are the ones responsible for the depletion of the ozone - which leads to leaving a hole in its layer. These gases eat out the ozone layer and allows harmful UV rays of the sun to come in the Earth.

In your own words, explain a crucial piece of evidence that Johannes Kepler could have used to support one of his laws of planetary motion.

Answers

Johannes Kepler could have used Evidence gathered by "Tycho Brahe" on the detailed positions of Mars in the sky. He used his entire data, plus Newton's view of observation, then he formulated his law of Planetary motion

Hope this helps!

Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation: H2O2 + N2H4 → N2 + H2O

a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250)

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675)

c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)

Answers

Explanation:

The equation of the reaction is;

H2O2 + N2H4 → N2 + H2O

Upon balancing the reaction, we have;

N2H4 + 2H2O2 → N2 + 4H2O  

a. How many moles of N2 are formed from 0.0250 moles of N2H4?

From the equation of the reaction;

1 mol of N2H4 produces 1 mol of N2

0.0250 mol of N2H4 would produce x mol of N2

1 = 1

0.0250 = x

x = 0.0250 * 1 / 1 = 0.0250 mol

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced?

From the equation of the reaction;

2 mol of H2O2 produces 4 mol of H2O

x mol of H2O2 produces 1.35 mol of H2O

2 = 4

x = 1.35

x = 1.35 * 2 / 4 = 0.675 mol

c. How many moles of H2O are formed if 1.87 moles of N2 is produced?

The relationship between H2O produced and N2 is;

For every 1 mol of N2 produced, 4 mol of H2O is produced

1.87 mol of N2 produced, how many moles of H2O is produced?

1 = 4

1.87 = x

x = 1.87 * 4 / 1 = 7.48 mol

What is the total amount of heat required to vaporize 1.00 gram of H2O(g) at 100.0C and 1 atmosphere?(1) 4.18 J(2) 334 J(3) 373 J(4) 2260 J

Answers

for this you will need the latent heat capacity for the vaporization of water. 
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